Technical rept. 1 Jun 1993-31 May 1994
UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE
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Polybenzoxazoles PBOs are a class of rigid-rod polymers that are known to have good thermal stability, high mechanical properties, and environmental resistance. Processing of PBOs is difficult since they have low solubility, high glass transition temperatures, and decompose before their melting points. This study is focused on improving the processibility of polybenzoxazoles by increasing their solubility while maintaining good thermal stability. With this goal in mind, we synthesized thianthrene-based PBOs from thianthrene-2,7- and 2,8-dicarbonyl chlorides with commercially available bis-o- aminophenols. Polymers were prepared in polyphosphoric acid at 90-200 deg C. Transparent PBO films were casted from polymerization solutions and m-cresol depending on solubility. Thermal analysis has shown 10 weight loss in air at 500 deg C. DMA has shown good mechanical properties with a transition 400 deg C for polymer I-HAB.
- Inorganic Chemistry
- Organic Chemistry
- Polymer Chemistry